We just purchased a 2015 Chevy Silverado 4x4 3500 extended cab long box dually to carry our ALP Adventurer 86 SBS. We purchased the MyLink infotainment system as an option. There is a backup camera in...
Maybe you could take a picture of the camera plug when the tail gate is removed and check with someone like RVCam to see if there is anything special about it. Does your current camera only work in reverse? That is the only drawback that I have seen to the factory cameras.
Or, how about going to Chevy and seeing if you can buy just the camera and mount with an extension cord?